Inspiration is fuel for entrepreneurs. This is especially true – and needed – when they are facing the biggest challenges of creating a business. Facing critics, dealing with setbacks and staying motivated in the face of seemingly endless challenges have made even the best entrepreneurs second guess their plans. But these 10 quotes will deliver the motivation and inspiration you need, right when you need it most.

When You’re Facing Critics

“Don’t be distracted by criticism. Remember–the only taste of success some people get is to take a bite out of you.” (Zig Ziglar)

“There are two types of people who will tell you that you cannot make a difference in this world: those who are afraid to try and those who are afraid you will succeed.” (Ray Goforth)

“I cannot give you the formula for success, but I can give you the formula for failure–It is: Try to please everybody.” (Herbert Bayard Swope)

When Failure Comes to Town

“Would you like me to give you a formula for success? It’s quite simple, really: Double your rate of failure. You are thinking of failure as the enemy of success. But it isn’t at all. You can be discouraged by failure or you can learn from it, so go ahead and make mistakes. Make all you can. Because remember that’s where you will find success.” (Thomas J. Watson)

“It is better to fail in originality than to succeed in imitation.” (Herman Melville)

“Many of life’s failures are people who did not realize how close they were to success when they gave up.” (Thomas Edison)

On Perseverance

“I find that the harder I work, the more luck I seem to have.” (Thomas Jefferson)

“If you really look closely, most overnight successes took a long time.” (Steve Jobs)

“Character cannot be developed in ease and quiet. Only through experience of trial and suffering can the soul be strengthened, ambition inspired, and success achieved.” (Helen Keller)

“Fall seven times and stand up eight.” (Japanese Proverb)